Phosphoryl bromide

Phosphoryl bromide

Names
Other names Phosphorus oxybromide
Identifiers
CAS Number	7789-59-5
ChemSpider	23015
Jmol interactive 3D	Image
PubChem	24613
InChI InChI=1S/Br3OP/c1-5(2,3)4 Key: UXCDUFKZSUBXGM-UHFFFAOYSA-N InChI=1/Br3OP/c1-5(2,3)4 Key: UXCDUFKZSUBXGM-UHFFFAOYAH
SMILES O=P(Br)(Br)Br
Properties
Chemical formula	POBr3
Molar mass	286.69 g/mol
Density	2.82 g cm^−3
Melting point	56 °C (133 °F; 329 K)
Boiling point	192 °C (378 °F; 465 K)
Hazards
EU classification (DSD)	C
R-phrases	R14, R34, R37
S-phrases	S7/8, S26, S36/37/39, S43, S45
Related compounds
Related compounds	Phosphorus tribromide Thiophosphoryl bromide Phosphoryl fluoride Phosphoryl chloride
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Phosphoryl bromide, also known as phosphorus oxybromide, is an inorganic compound with the formula POBr₃. It can be prepared via the slow addition of liquid bromine to phosphorus tribromide at 0 °C, followed by the slow addition of water and vacuum distillation of the resulting slurry.

It is prepared according to the equation: 3 PBr₅ + P₂O₅ → 5 POBr₃^[1][2]

Properties

Thin plates, faint orange tint, d 2.822. mp 56° (in hot water). bp758 193° (decomposes). Slowly hydrolyzes in water forming H₃PO₄ and HBr. Soluble in ether, benzene, chloroform, carbon disulfide, concentrated H₂SO₄. Store in sealed glass ampoules.

References

^{[3] [4] [5]}

1. Hönigschmid, Hirschbold-Wittner, Z. Anorg. Allg. Chem. 243, 355 (1940)
2. Johnson, Nunn, J. Am. Chem. Soc. 63, 141 (1941); Booth, Seegmiller, Inorg. Synth. 2, 151 (1946)
3. Jacob, E. Jean, Donald D. Danielson, and Svein Samdal. "An electron diffraction determination of the molecular structures of phosphoryl bromide and thiophosphoryl bromide." Journal of Molecular Structure 62 (1980): 143-155.
4. Bell, I. S., P. A. Hamilton, and P. B. Davies. "Infrared Diode–Laser Spectroscopy of Phosphoryl Bromide (BrPO)." Journal of molecular spectroscopy 195.2 (1999): 340-344.
5. Okuda, Tsutomu, et al. "Structural study of phosphoryl bromide by means of nuclear quadrupole resonance." Inorganic Chemistry 14.5 (1975): 1207-1209.